<!DOCTYPE html>
<html>
<head>
<style>
.container{
  background:#a1a1a1;
  display:flex;
  flex-flow:row;
  height:500px;
}
.main {
  width: 60%;
 
}
.left {
  flex: 1;
  background:pink;
}
.right {
  flex: 2;
  background:pink;
}
</style>
</head>
<body>
 
<div class="container">
  <nav class="nav left">…</nav>
 
  <section class="main">
    Winter comes after autumn.It snows heavily here....
  </section>
 
  <nav class="nav right">…</nav>
 
</div>
</body>
</html>